英语听力：自然百科 黄石公园的夏天 Yellowstone—13

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As the flow becomes slow enough for the trout² to lay eggs, there is a brief window of opportunity to spawn³ before the river gets too shallow to swim upstream. The female digs a trough with sinuous⁴ flicks⁵ of her body. And the attending male fertilizes⁶ the eggs as they are laid. Millions of new lives. 

 

It's now early July. And what looks like more snow is actually a blizzard⁷ of seeds and insects. There is more life in the park now than at

 

any other time of the year. It's a turning point in the summer. Through the coming month, the days will get hotter and drier. The plants will grow less vigorously, and the pace of summer will slow. 

 

The meadows are not so welcoming now. The grass becomes less nourishing as it puts its energy into seeds and roots.

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